There is NO airport called “Frankfurt International”. Using that term can cause confusion. Frankfurt has two international airports. Frankfurt Main airport (FRA, Flughafen Frankfurt Main) is the main one near the city.
The only reason anyone stays it to get experience to move on to a different airline. The pay is good and the other cabin crew are great and you get to meet a lot of people. After your shift you get to go home there are no over night stays unless necessary which is barely.
Night flying restrictions are common at airports in Europe. Most airports in Germany have restrictions and curfews during the night. Several night flying restrictions including full night flight bans have been introduced in order to ensure that residents living near airports can sleep at night.
Frankfurt is a global hub for commerce, culture, education, tourism and transportation, and is the site of many global and European corporate headquarters.